2023年思科認(rèn)證考試歷年高頻考點(diǎn)試題3答案解析

2023年思科認(rèn)證考試歷年高頻考點(diǎn)試題答案解析預(yù)?？荚図樌?！卷I一.綜合考試題庫(kù)(共25題)1.[單選題]路由器“全局模式”的提示符為（）

A.>

C.(config)

D.(config-router)

正確答案:C

(config)

解析：C

2.[多選題]YouarebringingupanewEzonexamswitch,andwishtoconnectitviaatrunktoanotherswitchfromadifferentvendor,whichusestheIEEEstandardforthetrunkingmethod.Whensettingtheencapsulationtypeonthetrunk,whatshouldyouconfigureontheCiscoswitch?

A.Switch(config)switchporttrunkencapsulationisl

B.Switch(config)switchporttrunkencapsulationietf

C.Switch(config-if)switchporttrunkencapsulationisl

D.Switch(config-if)switchporttrunkencapsulationietf

E.Switch(config-if)switchporttrunkencapsulationdot1q

正確答案:ABCDE

Switch(config)switchporttrunkencapsulationislSwitch(config)switchporttrunkencapsulationietfSwitch(config-if)switchporttrunkencapsulationislSwitch(config-if)switchporttrunkencapsulationietfSwitch(config-if)switchporttrunkencapsulationdot1q

解析：解析：Explanation:

3.[單選題]下列命令中，無(wú)法正確執(zhí)行的是（）

A.Router(config)showrun

B.Routerping

C.Router(config)hostnamecisco

D.Routerreload

正確答案:A

Router(config)showrun

解析：A

4.[單選題]WhatisthepurposeoftheSpanningTreeProtocol(STP)?

A.Topreventroutingloops

B.Tocreateadefaultroute

C.Toprovidemultiplegatewaysforhosts

D.Tomaintainaloop-freeLayer2networktopology

E.ToenhancethefunctionsofSNMP

正確答案:D

Tomaintainaloop-freeLayer2networktopology

解析：解析：Explanation:

5.[單選題]ThenetworkadministratorhasconfiguredportsecurityonaEzonexamswitch.WhywouldanetworkadministratorconfigureportsecurityonthisEzonexamdevice?

A.TopreventunauthorizedhostsfromgettingaccesstotheLAN

B.TolimitthenumberofLayer2broadcastsonaparticularswitchport

C.TopreventunauthorizedTelnetorSSHaccesstoaswitchport

D.TopreventtheIPandMACaddressoftheswitchandassociatedports

E.Noneoftheabove

正確答案:A

TopreventunauthorizedhostsfromgettingaccesstotheLAN

解析：解析：Explanation:

6.[單選題]交換機(jī)轉(zhuǎn)發(fā)數(shù)據(jù)到目的地依靠()

A.路由表

B.MAC地址表

C.訪問(wèn)權(quán)限表

D.靜態(tài)列表

正確答案:B

MAC地址表

解析：B

7.[多選題]EzonexamismigratingtoaprivateIPaddressingscheme.WhichofthefollowingdescribetheuseofprivateIPaddresses?(Choosetwo)

A.AddresseschosenbyEtocommunicatewiththeInternet.

B.AddressesthatcannotberoutedthroughthepublicInternet.

C.AddressesthatcanberoutedthroughthepublicInternet.

D.Aschemetoconservepublicaddresses.

E.AddresseslicensedtoenterpriseorISPsbyanInternetregistryorganization.

正確答案:BD

AddressesthatcannotberoutedthroughthepublicInternet.Aschemetoconservepublicaddresses.

解析：解析：Explanation:

8.[單選題]TheEzonexamLANisupgradingalldevicestooperateinfullduplex.Whichstatementistrueaboutfull-duplexEthernetincomparisontohalf-duplexEthernet?

A.Full-duplexEthernetusestwowirestosendandreceive.Half-duplexEthernetusesonewiretosendandreceive

B.Full-duplexEthernetconsistsofasharedcablesegment.Half-duplexEthernetprovidesapoint-to-pointlink

C.Full-duplexEthernetcanprovidehigherthroughoutthancanhalf-duplexEthernetofthesamebandwidth

D.Full-duplexEthernetusesaloopbackcircuittodetectcollisions.Half-duplexethernetusesajamsignal

E.Noneoftheabove

正確答案:C

Full-duplexEthernetcanprovidehigherthroughoutthancanhalf-duplexEthernetofthesamebandwidth

解析：C

9.[單選題]Whiletroubleshootingaconnectivityproblemonthenetwork,youissuethepingcommandfromyourPCcommandprompt,buttheoutputshows"requesttimesout."AtwhichOSIlayeristhisproblemassociatedwith?

A.Thedatalinklayer

B.Theapplicationlayer

C.Theaccesslayer

D.Thesessionlayer

E.Thenetworklayer

正確答案:E

Thenetworklayer

解析：解析：Explanation:

10.[單選題]要把交換機(jī)的配置文件保存到tftp服務(wù)器，應(yīng)使用的命令為（）

A.copyiostftp

B.copyrunning-configtftp

C.copyflashtftp

D.copyconfigtftp

正確答案:B

copyrunning-configtftp

解析：B

11.[多選題]Usingasubnetmaskof24,whichoftheIPaddressesbelowcanyouassigntothehostsonthissubnet?(Selectallthatapply)

A.3

B.59

C.3

D.6

E.7

F.F.92

正確答案:CDE

367

解析：C,D,E解析：Explanation:

12.[單選題]AtwhichlayeroftheOSImodeldoestheprotocolthatprovidestheinformationdisplayedbythe"showcdpneighbors"commandoperate?

A.Transport

B.Physical

C.Application

D.Datalink

E.Network

正確答案:D

Datalink

解析：解析：Explanation:

13.[單選題]IP地址為：0，掩碼為：48，則該IP地址所在子網(wǎng)的子網(wǎng)號(hào)為（）

A.2

B.4

C.6

D.1

正確答案:B

4

解析：B

14.[單選題]幀中繼環(huán)境中，在物理端口上，建立子接口的命令是（）

A.create

B.interface

C.encapsulation

D.ipaddress

正確答案:B

interface

解析：B

15.[單選題]下面有關(guān)交換機(jī)的描述中，正確的是（）

A.所有交換機(jī)都支持VLAN功能

B.交換機(jī)端口數(shù)量最多為48口

C.交換機(jī)獨(dú)占帶寬

D.交換機(jī)端口的最大速率為100Mbit/s

正確答案:C

交換機(jī)獨(dú)占帶寬

解析：C

16.[單選題]RIP協(xié)議的管理距離是（）

A.100

B.110

C.120

D.150

正確答案:B

110

解析：B

17.[單選題]網(wǎng)關(guān)的功能（）

A.過(guò)濾數(shù)據(jù)包

B.不同網(wǎng)段通信

C.校驗(yàn)數(shù)據(jù)幀

D.把數(shù)據(jù)封裝成“段”

正確答案:B

不同網(wǎng)段通信

解析：B

18.[單選題]在路由表中到達(dá)同一網(wǎng)絡(luò)的路由有：靜態(tài)路由、RIP路由、IGRP路由，OSPF路由，則路由器會(huì)選用哪條路由傳輸數(shù)據(jù)：()

A.靜態(tài)路由

B.RIP路由

C.IGRP路由

D.OSPF路由

正確答案:A

靜態(tài)路由

解析：A

19.[單選題]介質(zhì)工作在OSI的哪一層（）

A.物理層

B.數(shù)據(jù)鏈路層(datalinklayer)

C.網(wǎng)絡(luò)層

D.傳輸層

正確答案:A

物理層

解析：A

20.[單選題]TheEzonexamnetworkadministratorhasjustissuedthe"switchporttrunknativevlan998"commandonswitchVE2.Whatisthefunctionofthiscommand?

A.ItdesignatesVLAN998asthedefaultforallunknowntaggedtraffic

B.ItdesignatesVLAN998foruntaggedtraffic

C.ItblocksVLAN998trafficfrompassingonthetrunk

D.ItcreatesaVLAN998interface

E.Noneoftheabove

正確答案:B

ItdesignatesVLAN998foruntaggedtraffic

解析：B

21.[單選題]下列關(guān)于路由器和交換機(jī)的描述中，錯(cuò)誤的是（）

A.路由器可以用來(lái)連接internet

B.二層交換機(jī)可以用來(lái)實(shí)現(xiàn)“異地網(wǎng)絡(luò)”互連

C.路由器可以用來(lái)做路徑選擇

D.交換機(jī)可以轉(zhuǎn)發(fā)廣播

正確答案:D

交換機(jī)可以轉(zhuǎn)發(fā)廣播

解析：D

22.[單選題]通配符掩碼和子網(wǎng)掩碼之間的關(guān)系是（）。

A.兩者沒(méi)有什么區(qū)別

B.通配符掩碼和子網(wǎng)掩碼恰好相反

C.一個(gè)是十進(jìn)制(decimalsystem)的，另一個(gè)是十六進(jìn)制(hexadecimalsystem)的

D.兩者都是自動(dòng)生成的

正確答案:A

兩者沒(méi)有什么區(qū)別

解析：A

23.[單選題]能夠分配給設(shè)備的IP，應(yīng)該是（）

A.網(wǎng)絡(luò)有效IP

B.網(wǎng)絡(luò)號(hào)

C.網(wǎng)絡(luò)廣播地址

D.任意IP

正確答案:A

網(wǎng)絡(luò)有效IP

解析：A

24.[多選題]TwostationsontheEzonexamLANtransmitatthesametime,resultinginacollision.Whathappenswhenacollisionoccursonthenetwork?(Chooseallthatapply)

A.EachdeviceontheEthernetsegmentstopstransmittingforashorttime.

B.Ajamsignalinformsalldevicesthatacollisionoccurred.

C.Whendatatransmissionresumes,thedevicesthatwereinvolvedinthecollisionhaveprioritytotransmit.

D.Thedevicesthatareinvolvedinthecollisionstopstransmittingforashorttime.

E.Thecollisioninvokesarandomback-offalgorithm.

正確答案:BDE

Ajamsignalinformsalldevicesthatacollisionoccurred.Thedevicesthatareinvolvedinthecollisionstopstransmittingforashorttime.Thecollisioninvokesarandomback-offalgorithm.

解析：解析：Explanation:

25.[單選題]下面哪個(gè)操作可以使訪問(wèn)控制列表真正生效（）。

A.將訪問(wèn)控制列表應(yīng)用到接口上

B.定義擴(kuò)展訪問(wèn)控制列表

C.定義多條訪問(wèn)控制列表的組合

D.用access-list命令配置訪問(wèn)控制列表

正確答案:A

將訪問(wèn)控制列表應(yīng)用到接口上

解析：A

卷II一.綜合考試題庫(kù)(共25題)1.[單選題]下列路由協(xié)議中，屬于鏈路狀態(tài)路由協(xié)議的是（）

A.RIP

B.EIGRP

C.IGRP

D.OSPF

正確答案:D

OSPF

解析：D

2.[單選題]YouareaseniornetworkadministratoratEzonexam,andwhileperformingthepasswordrecoveryprocedureonyour2500seriesCiscorouter,youtypeinthefollowingcommand:o/r0x2142

A.Whatisthepurposeofthiscommand?

B.Itisusedtorestarttherouter.

C.ItisusedtobypasstheconfigurationinNVRAM.

D.ItisusedtoenterROMMonitormode.

E.Itisusedtoviewthelostpassword.

F.Itisusedtosavethechangestotheconfiguration.

正確答案:C

ItisusedtobypasstheconfigurationinNVRAM.

解析：解析：Explanation:

3.[單選題]Afterloggingintoarouterandtypinginafewshowcommands,youpresstheuparrowkey.Whatwillthisdo?

A.Itwillrecallthepreviouscommandline

B.Itwillmovethecursoronelineup

C.Itwillredisplaythecurrentcommandline

D.Itwillcapitalizethecommandline

E.Noneoftheabove

正確答案:A

Itwillrecallthepreviouscommandline

解析：解析：Explanation:

4.[單選題]WhenisaswitchednetworkthatisrunningtheSpanningTreeProtocolconsideredtobefullyconverged?

A.whenallswitcheshavethesameBIDastherootswitch

B.whenallswitcheshavereceivedtheMACaddressofeachneighboringswitch

C.wheneveryenabledswitchporthasbeenassignedauniqueidentifier

D.wheneveryoperatingswitchportisineithertheblockingorforwardingstate

E.whenallswitchesareineitherclient,server,ortransparentmode

正確答案:D

wheneveryoperatingswitchportisineithertheblockingorforwardingstate

解析：解析：Explanation:

5.[單選題]基本IP訪問(wèn)權(quán)限表的表號(hào)范圍是：()

A.1—100

B.1-99

C.100-199

D.800-899

正確答案:B

1-99

解析：B

6.[單選題]為了連接“幀中繼”線路，網(wǎng)絡(luò)中的路由器需要提供的端口類(lèi)型為（）

A.FastEthernet

B.Serial

C.BRI

D.Ethernet

正確答案:B

Serial

解析：B

7.[單選題]下列哪個(gè)network命令會(huì)告知此路由器開(kāi)始使用IP地址為、和的接口上的OSPF（）

A.networkarea0

B.network55area0

C.network55area0

D.network55area0

正確答案:B

network55area0

解析：B

8.[單選題]OSI第二層數(shù)據(jù)封裝完成后的名稱(chēng)是：()

A.比特

B.包

C.幀

D.段

正確答案:C

幀

解析：C

9.[多選題]Whichofthefollowingstatementscorrectlydescribethedifferencesbetweenhalf-duplexandfull-duplexEthernet?(Selecttwoanswerchoices.)

A.Full-duplexEthernetusesCSMA/CDtopreventcollisions.

B.Half-duplexEthernetusesaloopbackcircuittodetectcollisions.

C.Afull-duplexEthernetcardallows20Mbpsfordatatransmission.

D.Full-duplexEthernetmakesuseoftwopairsofwiresfordata.

E.AnEthernethubcanoperatebothhalfandfullduplexsimultaneously.

正確答案:BD

Half-duplexEthernetusesaloopbackcircuittodetectcollisions.Full-duplexEthernetmakesuseoftwopairsofwiresfordata.

解析：解析：Explanation:

10.[單選題]OSPF在同一區(qū)域內(nèi)，下列說(shuō)法正確的是（）

A.每臺(tái)路由器生成的LSA都是相同的

B.每臺(tái)路由器的LSDB(鏈路狀態(tài)數(shù)據(jù)庫(kù))都是相同的

C.每臺(tái)路由器根據(jù)該LSDB計(jì)算出的最短路徑樹(shù)都是相同的

D.每臺(tái)路由器根據(jù)該最短路徑樹(shù)計(jì)算出的路由都是相同的

正確答案:B

每臺(tái)路由器的LSDB(鏈路狀態(tài)數(shù)據(jù)庫(kù))都是相同的

解析：B

11.[單選題]配置路由器時(shí)，封裝PPP協(xié)議的命令是：()

A.encapppp

B.ppp

C.groupppp

D.intppp

正確答案:A

encapppp

解析：A

12.[多選題]TheEzonexamnetworkadministratorneedstodeterminewhatLANdevicestoinstallontheEzonexamnetwork.WhataretwoadvantagesofusingLayer2Ethernetswitchesoverhubs?(Choosetwo)

A.Allowingsimultaneousframe.transmissions

B.Increasingthesizeofbroadcastdomains

C.IncreasingthemaximumlengthofUTPcablingbetweendevices

D.FilteringframesbasedonMACaddresses

E.Decreasingthenumberofcollisiondomains

正確答案:AD

Allowingsimultaneousframe.transmissionsFilteringframesbasedonMACaddresses

解析：解析：Explanation:A:Ahalfduplexconnectioniswhereonlyonedevicecansendorreceiveatatime.Afullduplexconnectioniswherebothdevicescansendandreceiveatthesametime.Thus,ifyouhavea100Mbhalf-duplexconnection,onlysendingat100MbORreceivingat100Mbcanhappenatthesametime.Ifyouhavea100Mbfullduplexconnection,youcaneffectivelyget200Mboutofthelinkbecauseyoucouldbesending100Mbandreceiving100Mbatthesametime.D:SwitchesarecapableoffilteringframesbasedonanyLayer2fields.Forexample,aswitchcanbeprogrammedtoreject(notforward)allframessourcedfromaparticularnetwork.Becauselinklayerinformationoftenincludesareferencetoanupper-layerprotocol,switchesusuallycanfilteronthisparameter.Furthermore,filterscanbehelpfulindealingwithunnecessarybroadcastandmulticastpackets.

13.[多選題]Youneedtodescribethevarioustypesofflowcontroltoyourco-workers.Whichofthefollowingaretypesofflowcontrolthatcanbeusedinanetwork?(Choosethree)

A.Congestionavoidance

B.Windowing

C.Cut-through

D.Buffering

E.LoadBalacing

F.F.FastForward

正確答案:ABD

CongestionavoidanceWindowingBuffering

解析：A,B,D

14.[多選題]網(wǎng)絡(luò)中經(jīng)常使用“幀中繼”服務(wù)，請(qǐng)選出幀中繼的優(yōu)點(diǎn)（）

A.偷占帶寬

B.提供擁塞管理機(jī)制

C.可以使用任意廣域網(wǎng)協(xié)議

D.靈活的接入方式

正確答案:ABD

偷占帶寬提供擁塞管理機(jī)制靈活的接入方式

解析：ABD

15.[多選題]請(qǐng)選出交換機(jī)處理幀的三種模式：()

A.直通模式

B.存儲(chǔ)轉(zhuǎn)發(fā)模式

C.偵測(cè)模式

D.分段模式

E.阻塞模式

正確答案:ABE

直通模式存儲(chǔ)轉(zhuǎn)發(fā)模式阻塞模式

解析：ABE

16.[單選題]路由器上的命令“showversion”的功能是（）

A.顯示版本信息

B.顯示端口配置信息

C.顯示路由表

D.顯示路由協(xié)議信息

正確答案:A

顯示版本信息

解析：A

17.[單選題]IP地址為：0，掩碼為：48，則該IP和掩碼結(jié)合劃分子網(wǎng)時(shí)，每個(gè)子網(wǎng)的容量為（）

A.8

B.4

C.12

D.6

正確答案:D

6

解析：D

18.[單選題]EzonexamhasimplementedtheuseoftheVirtualTrunkingProtocol(VTP).Whichstatementbelowaccuratelydescribesabenefitofdoingthis?

A.VTPwillallowphysicallyredundantlinkswhilepreventingswitchingloops

B.VTPwillallowswitchestoshareVLANconfigurationinformation

C.VTPwillallowasingleporttocarryinformationtomorethanoneVLAN

D.VTPwillallowforroutingbetweenVLANs

E.Noneoftheabove

正確答案:B

VTPwillallowswitchestoshareVLANconfigurationinformation

解析：B

19.[單選題]幀中繼(framerelay)環(huán)境下，為了區(qū)分虛電路，應(yīng)該使用的地址是（）

A.IP地址

B.MAC地址

C.DLCI

D.IPX地址

正確答案:C

DLCI

解析：C

20.[單選題]某網(wǎng)絡(luò)中，擬設(shè)計(jì)10子網(wǎng)，每個(gè)子網(wǎng)中放有14臺(tái)設(shè)備，用IP地址段為199.41.10.X，請(qǐng)問(wèn)符合此種規(guī)劃的子網(wǎng)掩碼是()

A.

B.

C.40

D.

正確答案:C

40

解析：C

21.[單選題]Whichoneofthefollowingcharacteristicsistrueregardingtheuseofhubsandswitches?

A.HubscanhavetheirportsbeconfiguredwithVLANs

B.Usinghubsiscostlywithregardtobandwidthavailability.

C.Switchescannotforwardbroadcasts.

D.Switchesaremoreefficientthanhubsinprocessingframes.

E.Switchesincreasethenumberofcollisiondomainsinthenetwork.

正確答案:E

Switchesincreasethenumberofcollisiondomainsinthenetwork.

解析：解析：Explanation:Switchesincreasesthenumberofcollisionsdomainsinthenetwork.SwitchesthatareconfiguredwithVLANswillreducethesizeofthecollisiondomainsbyincreasingthenumberofcollisiondomainsinanetwork,butmakingthemsmallerthanthatofonebig,flatnetwork.IncorrectAnswers:A.SwitchesarecapableofVLANconfigurations,buthubsarenot.B.Hubsaregenerallytheleastcostlymethodpossibletoconnectmultipledevicestogetherinanetwork.C.Switchesforwardbroadcastsandmulticasts,bydefault,toallportswithinthesameVLAN.Onlyroutersblockallbr